Nodular pulmonary amyloidosis.

A 72-year-old woman with a diagnosis of suspected rheumatoid arthritis was admitted with multiple pulmonary nodules in the bilateral lung field. To obtain a diagnosis, a nodule was resected using video-assisted thoracic surgery. Microscopically, amorphous eosinophilic acellular substances were surrounded by inflammatory infiltrates, which were confirmed to be amyloid deposits by congo red staining. Thus, a diagnosis of pulmonary amyloidosis was obtained. The clinical features and diagnostic process are discussed.